<template>
    <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 表格 -->
            <tree-table class="tree_table" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border>
                <template slot="isOk" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:green;"></i>
                    <i class="el-icon-error" v-else style="color:red;"></i>
                </template>
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
                    <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
                    <el-tag type="warning" size="mini" v-else>三级</el-tag>
                </template>
                <template slot="operation" slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteCate(scope.row.cat_id)">删除</el-button>
                </template>
            </tree-table>
            <!-- 分页 -->
            <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[1, 3, 5, 10]" :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper" :total="total">
            </el-pagination>
        </el-card>

        <!-- 添加分类对话框 -->
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级名称">
                    <el-cascader v-model="selectedKeys" placeholder="试试搜索：指南" :options="parentCateList" clearable :props="props" @change="parentCateChanged"></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 编辑分类对话框 -->
        <el-dialog title="编辑分类" :visible.sync="editCateDialogVisible" width="50%">
            <el-form :model="editCateForm" :rules="addCateFormRules" ref="editCateFormRef" label-width="100px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="editCateForm.cat_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editCate">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      catelist: [],
      total: 0,
      columns: [
        { label: '分类名称', prop: 'cat_name' },
        { label: '是否有效', type: 'template', template: 'isOk' },
        { label: '排序', type: 'template', template: 'order' },
        { label: '操作', type: 'template', template: 'operation' }
      ],
      addCateDialogVisible: false,
      editCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: { required: true, message: '不为空', trigger: 'blur' }
      },
      props: {
        label: 'cat_name',
        expandTrigger: 'hover',
        value: 'cat_id',
        checkStrictly: true
      },
      parentCateList: [],
      selectedKeys: [],
      editCateForm: {
        cat_name: ''
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //   初始化数据
    async getCateList() {
      const res = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取列表失败！')
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 改变分页长度获取数据
    handleSizeChange(val) {
      this.queryInfo.pagesize = val
      this.getCateList()
    },
    // 改变分页页码获取数据
    handleCurrentChange(val) {
      this.queryInfo.pagenum = val
      this.getCateList()
    },
    // 打开添加分类获取父级数据id数据
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级数据id数据
    async getParentCateList() {
      const res = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取列表失败！')
      this.parentCateList = res.data
    },
    // 联机选择器改变表单数据
    parentCateChanged() {
      this.addCateForm.cat_level = this.selectedKeys.length
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
      } else {
        this.addCateForm.cat_pid = 0
      }
    },
    // 关闭视图重置相关数据
    addCateDialogClosed() {
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_name = ''
      this.addCateForm.cat_pid = 0
      this.selectedKeys = []
    },
    // 添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const res = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败！')
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 获取数据，打开编辑
    async showEditCateDialog(id) {
      const res = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('获取失败！')
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
    // 编辑分类
    editCate() {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const id = this.editCateForm.cat_id
        const res = await this.$http.put('categories/' + id, { cat_name: this.editCateForm.cat_name })
        if (res.meta.status !== 200) return this.$message.error('修改分类失败！')
        this.$message.success('修改分类成功！')
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    // 删除分类
    async deleteCate(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return
      const res = await this.$http.delete(`categories/${id}`)
      if (res.meta.status !== 200) return this.$message.error('删除失败！')
      this.$message.success('删除分类成功！')
      this.getCateList()
    }
  }

}
</script>

<style lang="less" scoped>
.tree_table {
    margin-top: 20px;
}
.el-cascader {
    width: 100%;
}
</style>
